<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="product.id" readonly>
  <input type="text" v-model="product.title">
  <input type="text" v-model="product.price">
  <input type="text" v-model="product.num" >
  <input type="button" value="修改" @click="update()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
  let v = new Vue({
    el:"body>div",
    data:{
      product:{
        id:"",
        title:"",
        price:"",
        num:""
      }
    },
    methods:{
      update(){
        axios.post("/update",v.product).then(function () {
          alert("修改完成!")
          location.href="/list.html";
        })
      }
    },
    created:function () {
      axios.get("/selectById"+location.search).then(function (response) {
        v.product = response.data;
      })
    }
  })
</script>
</body>
</html>